How do I change my system so it shows apps, title bars, etc in dark grey?

[Tracy Wilkinson]

There was some system update last night and now I seem to be only able to pick between white and black modes, both of which I find very hard on the eyes. I have tried looking at "Colours" and "Themes" in the setting, but none of those say how I can change back to the old colour scheme that was much better.I've also searched online, and people seem to be saying it can't be done, but that can't be right.

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